Tom.....as a general rule of thumb, most military semi-auto and auto weapons were designed to "hold open" after the last round is fired....and all U.S. ones did. The M1 Carbine, M1 Rifle, M1 (Thompson) submachine gun, and the M1911 pistol all do.

In fact, the M1 (Garand) Rifle not only holds open, it even spits out it's used clip after the last round is fired.